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Why am I getting "Array indices must be positive integers or logical values" when trying to add together all the integers?

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Penelope Akgun
Penelope Akgun on 6 Dec 2019
Answered: Guillaume on 6 Dec 2019
So here is the Data set:
Cost=[
55.58
55.61
55.64
55.69
55.73
55.78
55.82
55.88
55.94
56.02
56.09
56.18
56.29
56.39
56.50
56.63
56.78
56.93
57.11
57.31
57.52
57.76
58.01
58.30
58.61
58.97
59.36
59.78
60.26
60.79
61.36
62.00
62.71
63.49
64.36
65.32
66.37
67.54
68.83
70.25
62.66
59.27
65.33
57.82
64.55
57.76
60.25
63.71
65.81
56.36
67.82
65.75
61.85
61.16
61.31
59.41
62.14
62.17
66.31
66.01
63.97
60.38
66.23
62.47
60.01
67.96
67.10
62.71
63.68
63.20
58.07
59.35
61.63
58.39
66.67
57.91
58.33
57.58
58.34
61.16
62.02
60.74
59.59
58.58
57.70
56.96
56.35
55.88
55.54
55.34
55.27
55.34
55.54
55.88
56.35
56.96
57.70
58.58
59.59];
C=sum(Cost)
When I run it, I keep getting errors. I've used other commands to find the max or min and they come out just fine. Thank you

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Answers (2)

Guillaume
Guillaume on 6 Dec 2019
Most likely you've created a variable called sum, so instead of summing the elements of Cost, you're using Cost as an index into the sum variable and of course as the error message tells you values like 55.58 are not valid indices.
Don't use sum, max, min, diff, etc. as variable names if you want to avoid this kind of problem.

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Image Analyst
Image Analyst on 6 Dec 2019
This is a VERY frequently asked question. So see the FAQ.
Your code runs fine though. I copied and pasted and got htis:
C =
5937.99
so something else must be wrong. Please give the COMPLETE error message, AFTER you read this link.

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